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n4freepatentsonline.
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isa:436485717
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The fingers project outwardly from the slots and carry bearing portions 17, 18, 19, respectively, which are adapted to engage the wall of the tube. (The bearing points may be made of Stellite or other material strongly resistant to abrasion, or may be fitted with a roller bearing or other means of minimizing wear.) Thus, the three movable fingers protrude radially through the slots in the shell
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isa:436485717